<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>02_Jquery快速入门</title>
    <script src="js/jquery-3.3.1.min.js"></script>
</head>
<body>

<div id="div1">div1...</div>
<div id="div2">div2...</div>

</body>

<script>
    let div1 = $("#div1")
    alert(div1.html())
    let div2 = $("#div2")
    alert(div2.html())

</script>

</html>